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DES.IsSemiWeakKey Method

Determines whether the specified key is semi-weak.

Namespace:  System.Security.Cryptography
Assembly:  mscorlib (in mscorlib.dll)

static member IsSemiWeakKey : 
        rgbKey:byte[] -> bool

Parameters

rgbKey
Type: System.Byte[]

The secret key to test for semi-weakness.

Return Value

Type: System.Boolean
true if the key is semi-weak; otherwise, false.

ExceptionCondition
CryptographicException

The size of the rgbKey parameter is not valid.

Semi-weak keys are pairs of keys that result in ciphers that are easy to break. If text is encrypted with a semi-weak key, encrypting the resulting cipher with the partner of that semi-weak key returns the original text. There are six known semi-weak key pairs for the Data Encryption Standard (DES) algorithm; this method checks for those semi-weak keys.

Attempting to set a semi-weak key results in a CryptographicException. When GenerateKey is called to create a random key, a semi-weak key will never be returned.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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